This page describes quotas and request limits for Cloud Storage.
There is a per-project rate limit to bucket creation and deletion of approximately 1 request every 2 seconds, so plan on fewer buckets and more objects in most cases. For example, a common design choice is to use one bucket per user of your project. However, if you're designing a system that adds many users per second, then design for many users in one bucket (with appropriate permissions) so that the bucket creation rate limit doesn't become a bottleneck.
Highly available applications should not depend on bucket creation or deletion in the critical path of their application. Bucket names are part of a centralized and global namespace: any dependency on this namespace creates a single point of failure for your application. Due to this and the 1 request per 2-second limit mentioned above, the recommended practice for highly available services on Cloud Storage is to pre-create all the buckets necessary.
There is an update limit on each bucket of once per second, so rapid updates to a single bucket (for example, changing the CORS configuration) won’t scale.
There is a limit of 100 members holding legacy IAM roles per bucket and a limit of 1500 members holding all IAM roles per bucket. Examples of members include individual users, groups, and domains. See IAM identities.
For buckets with Pub/Sub notifications:
The bucket can have up to 100 total notification configurations.
The bucket can have up to 10 notification configurations set to trigger for a specific event.
Each notification configuration can have up to 10 custom attributes.
There is a maximum size limit of 5 TiB for individual objects stored in Cloud Storage.
- The maximum size of a single upload request is also 5 TiB. For uploads that would take a long time over your connection, consider using resumable uploads in order to recover from intermediate failures. See Resumable uploads for more information.
There is a maximum combined size limit for all custom metadata keys and values of 8 KiB per object.
There is an update limit on each object of once per second, so rapid writes to a single object won’t scale. For more information, see Object immutability in Key Terms.
There is no limit to writes across multiple objects, which includes uploading, updating, and deleting objects. Buckets initially support roughly 1000 writes per second and then scale as needed.
There is no limit to reads of objects in a bucket, which includes reading object data, reading object metadata, and listing objects. Buckets initially support roughly 5000 object reads per second and then scale as needed.
For object composition:
Up to 32 objects can be composed in a single composition request.
While there is no limit to the number of components that make up a composite object, the
componentCountmetadata associated with a composite object saturates at 2,147,483,647.
Composite objects are subject to the overall 5 TiB size limit for objects stored in Cloud Storage.
JSON API requests
- When sending batch requests through the JSON API, do not include more than 100 calls in a single request. The total request payload must be less than 10MB. If more calls are needed, use multiple batch requests.
XML API requests
When sending requests through the XML API, there is a limit on the combined size of the request URL and HTTP headers of 16 KB.
When listing resources with the XML API, there is a limit of 1000 items that get returned.
When performing an XML API multipart upload, the following limits apply:
- A multipart upload can have up to 10,000 parts.
- An individual part has a maximum size limit of 5 GiB.
- An individual part has a minimum size limit of 5 MiB, unless it's the last part, which has no minimum size limit.
- Objects assembled from a multipart upload are subject to the overall 5 TiB size limit for objects stored in Cloud Storage.
- There is no limit to how long a multipart upload and its uploaded parts can remain unfinished or idle in a bucket.
HMAC keys for service accounts
- There is a limit of 5 HMAC keys per service account. Deleted keys do not count towards this limit.
Cloud Storage provides bandwidth monitoring for you to track the in-region read bandwidth usage of your project's buckets. Bandwidth monitoring is aggregated by region and tracks usage for the last 30 days. Bandwidth monitoring is not available for multi-regions.
In order to be tracked by bandwidth monitoring:
The usage must be by Google Cloud resources other than Cloud Storage buckets.
If the bucket is located in a region, the usage must be by resources located in the same region.
If the bucket is located in a dual-region, the usage must be by resources located in either of the regions that makes up the dual-region.
To view bandwidth monitoring: